A datacenter recently experienced a breach committed by a group that was able to access a server that had been shut down but not disconnected from the network. Which of the following could have prevented the breach from occurring? 

Answer options:

A. Disabling WOL in the server BIOS
B. Shutting down unneeded ports on the server
C. Installing anti-malware software on the server
D. Disabling non-essential services on the server

A